Chocolate Cake
Preheat oven to 350°. Coat bottom and sides of pan with nonstick spray; line bottom of pan with parchment paper. Whisk flour and next 4 ingredients in a large bowl. Add oil, vanilla, and 1 1/4 cups water; whisk until smooth. Fold in chopped chocolate. Scrape into prepared pan; smooth top. Bake until a tester comes out clean when inserted into center, 35–40 minutes. Let cool completely in pan on a wire rack.

Peanut Butter Icing
Use the $300 Icing as a base, cut butter in half from original recipe and whip in 1/2-3/4 cup peanut butter to taste.

Finishing
Run a thin knife around pan to release cake. Invert cake onto a serving plate. Spread peanut butter icing over top. Garnish with chopped chocolate and peanuts. DO AHEAD: Can be made 1 day ahead. Store airtight at room temperature.

Preheat the oven to 350°F. Line a baking sheet with parchment paper or a silicone liner.

In a small bowl, whisk together the flour, baking soda, and salt.

Place the butter in a medium microwave-safe bowl, and microwave briefly, until just melted. Add the sugars, and sift in the cocoa. (You can skip the sifting if you want, but my cocoa almost always has lumps, and I don’t like cocoa lumps in my cookies.) Stir to blend well. The mixture will be somewhat thick and pasty, like wet sand. Add the yogurt and vanilla and stir to mix thoroughly. Add the dry flour mixture, and stir to just combine. Add the chocolate chips and stir to incorporate.

Drop the dough by generous tablespoons onto the prepared baking sheet. (I use my tablespoon-size measuring spoon to scoop and shape the dough into little domes. Rinsing the spoon regularly helps to keep the dough from sticking, and leaving the spoon slightly wet after each rinsing helps too.) You should be able to fit about 8 or 9 cookies, nicely spaced, on a standard sheet pan. Bake for 9 to 11 minutes, or until the tops of the cookies have crackled slightly and look set. Transfer the sheet pan to a wire rack, and cool the cookies on the pan for 10 minutes. Transfer them to the rack to cool completely. Repeat with remaining dough.

Note: These cookies keep nicely at room temperature for a couple of days. I store mine in a large plastic bag, and I usually stick a paper towel in there with them. It helps to regulate moisture and keep the cookies fresh and chewy. (It’s a trick Brandon taught me, one he learned from an ex-girlfriend’s mother. Thank goodness for ex-girlfriends, right?)